Iam almost 30 years old and cannot remember what kindergarten I attended. I actually need that record in Illinois. What can I do to obtain this information?

First did you even go ? It was not always required ?

Do you have family that would remember ?

Next "need that record" OK, trivial contest, never heard of anyone, I have never even needed my grade school records.
I have only once or twice even needed high school records.

Your grade school records may have your kindergraden listed.
If it was private it may have longed closed with no records available

Call some of your old friends or call the public records department of the town where you lived.